I vaguely remmeber this happening to me as well a while ago. Do you see your player among the network devices in the explorer window? I think in one of the accompanied guides for the Pioneer players that was emphasises when using windows (sorry for the limited help, I’m writing from the phone as my desktop computer is in boxes as I’m moving to another apartment in a few days)
At first setup of my BDP-170 I also had crashes of iso2dsd. It turned out that this was caused by the auto-play function that was enabled by default. After turning auto-play off all was working fine.
If it worked before it might not make too much sense that a setting returns to its default, but you never know…
I found the problem thanks to the thread over at CA. When formatting as FAT I had left GUID Partition Map as the scheme when it should have been Master Boot Record.
Now that I’ve fixed that, the Pioneer reliably ejects its tray and talks to the PC. Ripping is once more underway.